JP2667066B2 - Electrophotographic plate making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic plate making apparatus in which a printing plate is developed with a liquid developer, and a fixing and elution process is performed.

[0002]

2. Description of the Related Art Conventionally, as a direct plate making apparatus, there is an electrophotographic plate making apparatus in which an electrophotographic printing plate is developed with a liquid developer, and the developed electrophotographic printing plate is fixed and eluted. In this type of electrophotographic plate making apparatus, an electrophotographic printing plate is developed in a developing section with a liquid developer including toner particles and a carrier liquid. In this development step, toner particles adhere to the image portion of the electrophotographic printing plate, and the electrostatic latent image is visualized. The developed electrophotographic printing plate is heated in a fixing processing section, and toner particles are fused and fixed to the electrophotographic printing plate. The non-image portion of the electrophotographic printing plate subjected to the fixing process is eluted in the next elution processing section.

However, a printing plate used for a printing press such as a newspaper uses a metal plate such as aluminum and is large in size.
It is necessary to increase the speed of plate making. On the other hand, in the fixing of the wet developing toner, a certain temperature range and a certain time (60 ° C. to 180 ° C., depending on the type of the toner, 1
Second to 10 seconds are required, and for example, a method is known in which the plate is heated by a rapid heating means such as a halogen lamp to fix the toner. Therefore, since the printing plate heated to a high temperature in such a melting and fixing process is inserted into the elution processing section, the temperature of the etching solution in the elution processing section rises, the printing plate is etched more than necessary, and the printing quality is reduced. The problem of lowering occurs.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned facts, the present invention prevents the temperature of an etching solution in an elution processing portion from rising,
It is an object of the present invention to provide an electrophotographic plate making apparatus capable of making a direct printing plate without deteriorating the quality of printed matter.

[0005]

According to a first aspect of the present invention, there is provided a developing unit for developing a direct printing plate conveyed in a predetermined direction by a conveying unit with a liquid developer, a fixing unit, and an elution unit. An electrophotographic prepress apparatus comprising:
Provided in the cooling unit between the elution portion and the fixing process unit
Cold cooling directly by the cooling water the direct printing plate is
And the direct printing plate is carried into the cooling unit.
Direct plate detection sensor for detecting that the cooling
A cooling water tank for storing water, and a cooling water tank disposed in the cooling water tank.
Temperature sensor and based on the temperature detected by the temperature sensor
Lower the cooling water temperature in the cooling water tank to below the specified temperature.
The cooler and the direct plate detection sensor are
When the printing plate is detected, the cooling water is cooled from the cooling water tank.
It is characterized <br/> by comprising a pump for feeding the cooling water to the unit.

The present invention according to claim 2 is characterized in that the cooling means has a structure for spraying the cooling water onto the direct printing plate.

The present invention according to claim 3 is characterized in that the cooling means has a structure in which the direct printing plate is immersed in the cooling water.

[0008]

According to the electrophotographic plate making apparatus of the present invention, the printing plate is cooled after the fixing process is performed in the fixing processing section.
The part is rapidly cooled directly by the cooling water from the cooling means , and then penetrates into the etching solution in the elution processing part.
At this time, the cooling water stored in the cooling water tank is
The temperature sensor installed in the waste water tank
Is detected, and a predetermined temperature is set by a cooler based on the detected temperature.
This cooling water is directly printed.
Plate detection sensor, direct printing plate is carried into the cooling means
When the pump detects that the cooling water tank
From the cooling means. Therefore, below the predetermined temperature
The lowered cooling water can be quickly supplied to the cooling means.
And directly cool the direct printing plate with this cooling water
To reduce the temperature of the direct printing plate sufficiently in a short time
Can be. As a result, depending on the temperature of the direct printing plate,
The temperature of the etching solution in the elution processing section does not rise, and the printing plate is not etched more than necessary. For this reason, it is possible to make a direct printing plate without lowering the quality of the printed matter.

Further, in the electrophotographic plate making apparatus according to the present invention, after the plate is subjected to fixing processing in the fixing processing section, the cooling means is rapidly cooled by spraying cooling water with cooling means. It penetrates into the etching solution in the elution processing section. Therefore, the printing plate does not raise the temperature of the etching solution in the elution processing section, and the printing plate is not etched more than necessary. For this reason, it is possible to make a direct printing plate without lowering the quality of the printed matter.

Further, in the electrophotographic plate making apparatus according to the present invention, after the printing plate is subjected to a fixing process in a fixing processing section, it is rapidly cooled by being immersed in cooling water in a cooling means, , Penetrates into the etching solution in the elution processing section. Therefore, the printing plate does not raise the temperature of the etching solution in the elution processing section, and the printing plate is not etched more than necessary. For this reason, it is possible to make a direct printing plate without lowering the quality of the printed matter.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, the direct printing plate 14 used in this embodiment is a thin plate-shaped electrophotographic printing plate.
A photoconductive photosensitive layer 30 is formed on one surface of a conductive support 28 to form an image forming surface. The conductive support 28 is made of an aluminum material and has a thickness of about 0.3 mm. Further, the conductive support 28 is formed of the photoconductive photosensitive layer 3.
The interface with 0 is subjected to a hydrophilic treatment. As the photoconductive photosensitive layer 30, for example, an organic photoconductive photoconductor is used.

As shown in FIG. 3, an electrophotographic plate making apparatus 10 to which the present invention is applied includes a plate feeding section 12, a drawing section 16, a developing and fixing processing section 18, a cooling section 120, an elution processing section 22, a standby section. 118, a puncher section 24 and a plate bending section 26 are provided.

The plate supply section 12 is arranged on the upstream side of the electrophotographic plate making apparatus 10 (on the side opposite to the arrow A direction in FIG. 3). The plate supply unit 12 includes a conveyor device (not shown), and transports the unexposed plate material 14 in the direction of arrow A in FIG. In this electrophotographic plate making apparatus 10, the direct printing plate 14 is arranged such that the longitudinal direction is along the arrow A direction in FIG. 3 and the direction opposite to the arrow A direction, and each processing is performed.

As shown in FIG. 4, the drawing section 16 is provided with a carrier 32 on which the direct printing plate 14 is placed.
The transfer table 32 can be moved in the direction of arrow A in FIG. A charger 34 for positively charging the photoconductive photosensitive layer 30 of the direct printing plate 14 is provided in the upper part of the drawing unit 16 in the direction of arrow A in FIG. An exposure section 36 is arranged on the side of the charger 34 in the direction of arrow A in FIG. The exposure section 36 is provided with a semiconductor laser (not shown), and irradiates a laser beam to an image portion of the charged photoconductive photosensitive layer 30 to scan and expose an image. The drawing unit 16 is provided with a nipping claw (not shown) that ejects the exposed direct printing plate 14 in the direction of arrow A in FIG.

As shown in FIG. 3, a developing / fixing processing section 18 is arranged on the drawing section 16 in the direction of arrow A in FIG. The developing and fixing processing section 18 includes a developing section 38, a squeeze section 4
0, a drying section 42, a fixing section 44 as a fixing processing section, and a transport device (not shown) for transporting the direct printing plate 14.

The developing section 38 is arranged on the upstream side of the developing / fixing section 18 and applies a liquid developer to the exposed direct printing plate 14 to make an electrostatic latent image of the direct printing plate 14 visible. The liquid developer used here is generally obtained by dispersing, in a carrier liquid, toner particles obtained by adsorbing a resin that imparts properties such as dispersibility, polarity controllability, and fixability to a pigment such as carbon black. . The development in the developing section 38 is performed by reversal development, and the positively charged direct printing plate 14 is developed with a toner having a positive charge. The portion of the direct printing plate 14 to which the toner adheres becomes lipophilic.

The squeezing unit 4 is located downstream of the developing unit 38 in the direction of transport of the direct printing plate 14 (in the direction of arrow A in FIG. 3).
0 is arranged. The squeeze unit 40 is provided with a blower (not shown), and blows air to both surfaces of the direct printing plate 14.

Direct printing plate 14 rather than squeeze section 40
On the downstream side in the transport direction (in the direction of arrow A in FIG. 3), a drying unit 42 is disposed. The drying unit 42 is provided with a dryer (not shown), and the direct printing plate 14 is dried by warm air of the dryer.

A fixing unit 44 is located downstream of the drying unit 42 in the transport direction of the direct printing plate 14 (in the direction of arrow A in FIG. 3).
Is arranged. The fixing unit 44 includes a plurality of heating lamps (not shown), and the heat of the heating lamps melts and fixes the toner particles adhering to the direct printing plate 14.

The cooling unit 12 is located downstream of the fixing unit 44 in the transport direction of the direct printing plate 14 (in the direction of arrow A in FIG. 3).
0 is arranged.

As shown in FIG. 1, a tray 123 is disposed below the cooling unit 120.
Above the three spray beds 1 for guiding the direct printing plate 14 conveyed from the fixing unit 44 in the direction of arrow A in FIG.
26 are provided. These spray beds 126
Have an L-shaped cross section having a vertical wall portion 126A on the upstream side in the transport direction of the direct printing plate 14, and are arranged in parallel with each other with a predetermined gap in the transport direction of the direct printing plate 14. I have.

An optical sensor 127 is provided above the upstream side of the cooling unit 120, and detects whether the direct printing plate 14 has been carried into the cooling unit 120 from the fixing unit 44 and controls the detection signal. To the device 154 (see FIG. 5).

Further, a water supply pipe 128 as a cooling means is provided upright from the bottom of the tray 123. The water supply pipe 128 is bifurcated in the vicinity of the bottom of the tray 123, one of which is further branched into three, and the tip 128 A of each branch has three spray beds 126.
Is located along the bottom of the. In addition, water supply pipe 12
8 is branched into two at the upper part of the three spray beds 126, and the leading end portions 128B of the respective branch portions are 3
The spray beds 126 are arranged along the gap.

As shown in FIG. 5, the water supply pipe 128
A circular through hole 130 is formed at predetermined intervals along the axial direction (perpendicular to the paper surface of FIG. 5) on the upper surface of the tip portion 128A of the spray bed 126. The upper wall portion 126B of the spray bed 126 has a through hole. A circular through hole 132 is formed coaxially with the hole 130. On the other hand, the tip 128B of the water supply pipe 128
Along the axial direction (perpendicular to the plane of FIG. 5)
Circular through holes 134 are formed at predetermined intervals, and are used as spray nozzles. Further, on the upstream side of the distal end portion 128B of the water supply pipe 128, a cock 136 is provided and is adapted to stop the supply of cooling water to the front end portion 128B of the water supply pipe 128. A squeeze roller 138 is provided on the downstream side of the cooling unit 120, and the direct printing plate 14 passes between the squeeze rollers 138.

The water supply pipe 128 penetrates the bottom of the tray 123 and extends downward.
It has reached zero. In the cooling water tank 140, the cooling water 1
The cooling water 142 is filled with the pump 14
4 pumps into the water supply pipe 128 . On the other hand, one end of the collecting pipe 146 is connected to the bottom of the receiving tray 123, and the other end of the collecting pipe 146 reaches the cooling water tank 140.
Of the cooling water 142 can be collected in the cooling water tank 140. In addition, a filter 148 is interposed in an intermediate portion of the recovery pipe 146 to remove foreign matter in the cooling water 142.

In the cooling water tank 140, cooling water 142
A temperature sensor 152 is provided for detecting the temperature of the control unit 154. The temperature sensor 152 is connected to the control device 154. The cooling water tank 140 is connected to a cooler 150, and the cooler 150 is connected to a control device 154. Therefore, as shown in the flowchart of FIG. 6, when the temperature T1 of the cooling water 142 in the cooling water tank 140 becomes equal to or higher than the predetermined temperature T0, the control device 1
54 is the cooler 1 based on the output signal of the temperature sensor 152.
Activating the cooling water 142 in the cooling water tank 140
Is lower than the predetermined temperature T0.

As shown in FIG. 3, an elution processing unit 22 is arranged downstream of the cooling unit 120 in the transport direction of the direct printing plate 14 (in the direction of arrow A in FIG. 3).

As shown in FIG. 7, an alkali solution is applied to the direct printing plate 14 in the elution processing unit 22 to thereby form a non-image portion of the direct printing plate 14 (ie, a non-image portion other than the portion where the toner image is formed). The elution section 48 for eluting the photoconductive photoreceptor layer, the squeeze section 50 for removing excess alkali solution adhered to the direct printing plate 14, and the water washing section for washing the squeezed direct printing plate 14 with water to remove the alkaline solution. 5
2. A gum solution application unit 54 for applying a gum solution to the washed direct printing plate 14, a drying unit 114 for drying the direct printing plate 14 to which the gum solution has been applied, and a plurality of nipping and transporting the direct printing plate 14. Transport rollers 56, 58, 60,
62, 64 and 66 are provided.

The transport roller 56 is disposed on the upstream side of the elution processing section 22 (on the side opposite to the direction of the arrow A in FIG. 7). The elution portion 48 is arranged on the side of the arrow A in FIG. 7). The elution section 48 is provided with an elution tank 68, and the elution tank 68 is provided with transport rollers 58 and 60 and a plurality of guide rollers 88. The direct printing plate 14 is transported by the transport rollers 58 and 60 and the guide roller 88 and is immersed in the alkaline solution in the elution tank 68. A circulation pump 84 is connected to the elution tank 68, sucks the alkaline solution in the tank, and sprays the alkaline solution from the nozzle 86 onto the direct printing plate 14.

The direct printing plate 14 in the elution tank 68
A roller-shaped brush 90 is arranged at a position corresponding to the photoconductive photosensitive layer 30. The brush 90 is connected to a rotation drive unit such as a motor (not shown), and the rotation drive unit rotates the brush 90. A drain pipe 82 is connected to the lower end of the elution tank 68, and the degraded alkaline solution in the tank can be discharged out of the tank via the drain pipe 82.

A squeeze section 50 is arranged downstream of the elution tank 68 in the direction of conveyance of the direct printing plate 14 (in the direction of arrow A in FIG. 7), and a conveyance roller 62 is arranged in the squeeze section 50. I have. The squeeze part 50 has a receiving part 9
The direct printing plate 14 is nipped by the transport roller 62 to remove the alkaline solution attached to the surface. A roller 96 is disposed on the receiving portion 94 side of the transport roller 62 in close contact with the transport roller 62, and the alkaline solution removed by the transport roller 62 is
6 and fall into the receiving portion 94. Further, a pump 98 for returning the removed alkaline solution to the elution tank 68 is connected to the receiving portion 94.

A washing section 52 is located downstream of the elution section 48 in the transport direction of the direct printing plate 14 (in the direction of arrow A in FIG. 7).
Are disposed, and a transport roller 64 is disposed in the water washing section 52. The washing unit 52 includes a roller-shaped brush 1
00 and a water receiving tank 102 are provided. Water receiving tank 102
Cleaning water is stored in the pump 10.
4 and is sprayed from the nozzle 106 onto the direct printing plate 14. The brush 100 is disposed at a position corresponding to the photoconductive photosensitive layer 30 of the direct printing plate 14, and can clean the photoconductive photosensitive layer 30 of the direct printing plate 14.

A gum solution application section 54 is disposed downstream of the water washing section 52 in the transport direction of the direct printing plate 14 (direction of arrow A in FIG. 7). In this gum solution application section 54,
A gum solution tank 110 is provided, and the gum solution is stored in the gum solution tank 110. The gum solution in the gum solution tank 110 is sucked up by the pump 112 and sprayed from the nozzle 114 onto the direct printing plate 14.

Direct printing plate 1 rather than gum solution application section 54
A drying unit 114 is disposed on the downstream side in the conveyance direction of No. 4 (in the direction of the arrow A in FIG. 7). The drying unit 114 is provided with a dryer 116, and the direct printing plate 14 after the gum treatment is dried by the dryer 116.

As shown in FIG. 3, a standby section 118 is disposed downstream of the elution processing section 22 in the transport direction of the direct printing plate 14 (in the direction of the arrow A in FIG. 3). The direct printing plate 14 is conveyed to the standby section 118. The standby unit 118 is provided with a conveyor device (not shown), and the conveyor device transports the direct printing plate 14 in the direction of arrow A in FIG.

A puncher section 24 is arranged downstream of the standby section 118 in the transport direction of the direct printing plate 14 (on the side of arrow A in FIG. 3). The puncher section 24 is provided with a punch (not shown) for forming a notch for positioning the direct printing plate 14 at the time of printing.

Direct printing plate 1 rather than puncher section 24
The plate bending portion 26 is arranged on the downstream side in the transport direction 4 (in the direction of the arrow A in FIG. 3). The plate bending portion 26 is provided with a bending device (not shown) for bending both ends of the direct printing plate 14 in the longitudinal direction by a predetermined size.

The operation of this embodiment will be described below. As shown in FIG. 3, the unexposed direct printing plate 14 is disposed along the transport direction with the photoconductive photosensitive layer 30 facing upward, and is transferred to the drawing unit 16 by a conveyor device (not shown) of the plate feeding unit 12. Conveyed. As shown in FIG. 4, in the drawing unit 16, the carriage 32 on which the direct printing plate 14 is placed is moved in the direction of arrow A in FIG. 4 by a driving device (not shown). During this movement, the direct printing plate 14 on the transfer table 32 is moved.
The photoconductive photosensitive layer 30 is positively charged by the charger 34. When the direct printing plate 14 is transported directly below the exposure unit 36, a laser beam corresponding to an original image emitted from a semiconductor laser (not shown) is irradiated on the surface of the photoconductive photosensitive layer 30. As a result, the incident portion where the laser beam is incident becomes conductive, positive charges move from the surface of the incident portion of the photoconductive photosensitive layer 30, and an electrostatic latent image corresponding to image information is formed. .

Direct printing plate 14 on which an electrostatic latent image is formed
Is held at the end by a not-shown holding claw, and is carried out from the drawing unit 16 to the developing / fixing processing unit 18.

In the developing / fixing processing section 18, in the direct printing plate 14, the positively charged toner particles in the liquid developer in the developing section 38 are adhered to the exposed portions of the photoconductive photosensitive layer 30.

When the direct printing plate 14 reaches the squeeze section 40, air from a blower (not shown) is blown to both surfaces of the direct printing plate 14, and excess liquid developer adhering to both surfaces is removed. After that, direct printing plate 14
Is transported to the drying unit 42, and the toner moistened with warm air from a dryer (not shown) is dried.

The thus-developed direct printing plate 14 is transported to the fixing section 44. In the fixing section 44, the toner attached to the direct printing plate 14 is melted and fixed by the heat of a heating lamp (not shown) and fixed. The direct printing plate 14 heated in the fixing unit 44 is
Transported to 0.

As shown in FIG. 1, the direct printing plate 14 conveyed to the cooling section 120 is conveyed along the spray bed 126 in the direction of arrow A in FIG. Also, the optical sensor 1
When the direct printing plate 14 is detected by 27, the pump 144 is operated by the control device 154. As a result, the cooling water 142 in the cooling water tank 140 is pumped into the water absorbing pipe 128 and is sprayed from the through hole 130 of the leading end portion 128A onto the direct printing plate 14, and also directly from the through hole 134 of the leading end portion 128B. The printing plate 14 is sprayed. Therefore, the direct printing plate 14 can be cooled quickly.

The cooling water 142 sprayed on the direct printing plate 14 is collected in a tray 123 and collected by a collecting pipe 14.
The foreign matter is removed by the filter 148 provided in the cooling water tank 6 and returned into the cooling water tank 140. When the temperature T1 of the cooling water 142 in the cooling water tank 140 becomes equal to or higher than the predetermined temperature T0, the control device 154 operates the cooler 150 based on the output signal of the temperature sensor 152 according to the flowchart of FIG. The temperature T1 of the cooling water 142 in the cooling water tank 140 is set lower than the predetermined temperature T0.

The squeeze roller 138 squeezes the cooling water 142 from the cooled direct printing plate 14 and conveys it to the elution processing section 22.

As shown in FIG. 7, the direct printing plate 14 conveyed to the elution processing section 22 is nipped by conveying rollers 56, conveyed into the elution tank 68, and immersed in an alkaline solution as an etching solution. In the direct printing plate 14 dipped in the alkaline solution, the photoconductive photoreceptor layer 30 without toner adhered thereto, that is, the non-image area is eluted. At this time, the photoconductive photoreceptor layer 30 of the direct printing plate 14 is rubbed by the brush 90 to promote the elution reaction. Due to this elution treatment, the surface of the direct printing plate 14 to which the toner has not adhered is exposed on the surface of the conductive support 14 on which the hydrophilic treatment has been performed. Also, even if cutting chips and the like are attached to the direct printing plate 14, all of them are removed with an alkaline solution.

After the elution process, the direct printing plate 14 is nipped between the conveying rollers 62 by the squeezing unit 50, and the alkaline solution attached to the surface is squeezed. The squeezed alkaline solution falls through the roller 96 to the receiving portion 94 and accumulates. The alkaline solution stored in the receiving portion 94 is returned to the elution tank 68 by the pump 90.

The squeezed direct printing plate 14 is conveyed to the washing section 52, and washing water is sprayed from the nozzle 106. Further, the direct printing plate 14 is rubbed by the brush 100, and the attached alkaline solution is completely removed.

When the direct printing plate 14 is conveyed and reaches the gum solution applying section 54, the gum solution is ejected from the nozzle 114 and the gum solution is applied to the direct printing plate 14. The direct printing plate 14 after the gum treatment is conveyed and the direct printing plate 1
When 4 reaches the drying section 114, the gum solution adhering to the direct printing plate 14 is dried by the hot air of the dryer 116. Thereby, the non-image portion (the portion where the toner is not adhered) of the direct printing plate 14 is hydrophilized.

The direct printing plate 14 processed in the elution processing unit 22 is then temporarily suspended in a standby unit 118, and is sent to a puncher unit 24 after plate inspection and the like, and is used for positioning by a punch (not shown). A notch is formed.

In the direct printing plate 14 in which the notch for positioning is formed by the puncher portion 24, both ends in the longitudinal direction of the direct printing plate 14 are bent by a predetermined size by a bending device (not shown) of the plate bending portion 26. Thus, the plate making process of the direct printing plate 14 is completed.

As described above, in the electrophotographic plate making apparatus 10 according to the present invention, the direct printing plate 1 heated in the fixing section 44 is used.
4 in the cooling unit 120 by the cooling water 142
The plate is cooled quickly, and then is transported into the elution tank 68 and immersed in the alkaline solution. Therefore, the temperature of the alkaline solution in the elution tank 68 rises by the direct printing plate 14, and the direct printing plate 14 Is not etched. For this reason, it is possible to make a direct printing plate 14 without lowering the quality of the printed matter.

The size of the electrophotographic plate making apparatus 10 can be reduced as compared with the case where the direct printing plate 14 is air-cooled. For example, when the direct printing plate 14 is conveyed at a rate of 50 mm / sec, and the direct printing plate 14 at 120 ° C. is cooled to 27 ° C. at a room temperature of 18 ° C., it takes about 2 minutes by natural cooling (cooling length). 6m), air cooling for 10-20 seconds (cooling length 5
In this embodiment, since the cooling can be performed in about 2 seconds (cooling length of 100 mm), the length of the cooling section can be reduced to about 150 mm even if the squeeze section is added to 50 mm. Furthermore, in order to improve the cooling effect with air cooling,
It is necessary to increase the wind speed, and there is a problem of an increase in the temperature of the blower fan and noise. Further, by performing water cooling, when a step of cutting the end corners and the like of the direct printing plate 14 after fixing and before etching is provided, the step of washing the shavings generated by the cutting can also be performed.

In this embodiment, the cooling water 142 in the cooling water tank 140 is pumped into the water absorption pipe 128,
From the through hole 130 at the tip 128A, the direct printing plate 1
4 and the through hole 1 of the tip portion 128B.
34, the direct printing plate 14 is sprayed onto the cooling plate. Alternatively, the direct printing plate passes through a cooling water tank filled with cooling water. It is good also as composition which is pickled.

[0056]

As described above, since the electrophotographic plate making apparatus of the present invention has the above-described configuration, it is possible to prevent a rise in the temperature of the etching solution in the elution processing section, and to provide a direct printing plate without deteriorating the quality of printed matter. It has an excellent effect that plate making can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cooling unit of an electrophotographic plate making apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a structure of a direct printing plate.

FIG. 3 is a plan view showing an arrangement of each processing unit of the electrophotographic plate making apparatus according to the embodiment of the present invention.

FIG. 4 is a sectional view showing a drawing unit of FIG. 3;

FIG. 5 is a perspective view illustrating a cooling unit of FIG. 3;

FIG. 6 is a flowchart illustrating temperature control of a cooling unit of the electrophotographic plate making apparatus according to the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing an elution processing section of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electrophotographic plate-making apparatus 14 Direct printing plate 22 Elution processing part 44 Fixing part 120 Cooling part 128 Water absorption pipe 142 Cooling water 144 Pump

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-224778 (JP, A) JP-A-4-134457 (JP, A) JP-A 56-49547 (JP, U)

Claims (3)

(57) [Claims] A developing unit for developing a direct printing plate conveyed in a predetermined direction by a conveying unit with a liquid developer;
An electrophotographic plate making device comprising a fixing processing unit and an elution processing unit, wherein the cooling unit is provided between the fixing processing unit and the elution processing unit.
Cold cooling directly by the cooling water the direct printing plate is
A retirement unit, detecting said that the direct printing plate is conveyed into the cooling unit
A direct printing plate detection sensor, a cooling water tank for storing the cooling water, a temperature sensor disposed in the cooling water tank, and a temperature sensor in the cooling water tank based on a temperature detected by the temperature sensor .
A cooler for lowering the cooling water temperature to a predetermined temperature or less, and the direct plate detection sensor controls the direct plate.
Upon detection, cooling from the cooling water tank to the cooling means
An electrophotographic plate making apparatus , comprising: a pump for feeding water . 2. The electrophotographic plate making apparatus according to claim 1, wherein the cooling means has a structure in which the cooling water is sprayed onto the direct printing plate. 3. The cooling device according to claim 1, wherein the cooling means is configured to immerse the direct printing plate in the cooling water.
The electrophotographic plate making device as described in the above.